<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

defined('THINK_PATH') or exit();
/**
 * Xcache缓存驱动
 * @category   Extend
 * @package  Extend
 * @subpackage  Driver.Cache
 * @author    liu21st <liu21st@gmail.com>
 */
class CacheXcache extends Cache {

	/**
	 * 架构函数
	 * @param array $options 缓存参数
	 * @access public
	 */
	public function __construct($options=array()) {
		if ( !function_exists('xcache_info') ) {
			throw_exception(L('_NOT_SUPPERT_').':Xcache');
		}
		$this->options['expire']    =   isset($options['expire'])?$options['expire']:C('DATA_CACHE_TIME');
		$this->options['prefix']    =   isset($options['prefix'])?$options['prefix']:C('DATA_CACHE_PREFIX');
		$this->options['length']    =   isset($options['length'])?$options['length']:0;
	}

	/**
	 * 读取缓存
	 * @access public
	 * @param string $name 缓存变量名
	 * @return mixed
	 */
	public function get($name) {
		N('cache_read',1);
		$name   =   $this->options['prefix'].$name;
		if (xcache_isset($name)) {
			return xcache_get($name);
		}
		return false;
	}

	/**
	 * 写入缓存
	 * @access public
	 * @param string $name 缓存变量名
	 * @param mixed $value  存储数据
	 * @param integer $expire  有效时间（秒）
	 * @return boolen
	 */
	public function set($name, $value,$expire=null) {
		N('cache_write',1);
		if(is_null($expire)) {
			$expire = $this->options['expire'] ;
		}
		$name   =   $this->options['prefix'].$name;
		if(xcache_set($name, $value, $expire)) {
			if($this->options['length']>0) {
				// 记录缓存队列
				$this->queue($name);
			}
			return true;
		}
		return false;
	}

	/**
	 * 删除缓存
	 * @access public
	 * @param string $name 缓存变量名
	 * @return boolen
	 */
	public function rm($name) {
		return xcache_unset($this->options['prefix'].$name);
	}
}